Fire Resistance UL Classifications

U919 - 4 hours - non load bearing walls 4" or thicker
U919 - 4 hours - load bearing walls 6" or thicker
U920 - 4 hours - reinforced wall panel
K909, U932 - 0.5, 1 hours - roof and slab panels 4" thick
K909, U932 - 0.5, 1, 1.5, 2, 3, 4 - roof and slab panels 6" to 12" thick

Fire Testing
ASTM E119 (ANSI / UL 263)
See fire test video

Standards and Approvals

ASTM E 72 -  test of panels for strength building construction
ASTM E 90 -  measurement of transmission class airborne sound transmission loss of building partitions
ASTM E 447 - compressive strength of strength masonry prisms
ASTM E 514 - determine of a wall water penetration and leakage system to prevent a driving through masonry rain from penetrating though the building envelope
ASTM E 518 - flexural bond strength of strength masonry
ASTM E 519 - determine wall shear diagonal tension (shear) in strength masonry
ANSI/UL 263 - determine fire rating fire tests of building construction and materials

Strength Class

ASTM C 1386
ASTM C 1452
There are 3 strength classes defined for AAC block products in ASTM C 1386 and 3 strength classes defined for reinforced AAC elements in ASTM C 1452.